Telephone system



flame 28, 1932 E. HGRN TELEPHONE SYSTEE-j Filed Jan. 2, 1931 HornPatented June 28, 1932 unrrsn srerss PATENT crater;

ERNST HOB-N, F BERLIN, GERMANY, ASSIGNOR T0 SIEMENS & HALSKE AKTIEN-GESELLSGI-IAFT, 01" SIEMENSSTADT, NEAR- BERLIN, GERMANY TELEPHONE SYSTEMApplication filed January 2, 1931, Serial No.

The invention relates to a circuit arrangement for telephone systems inwhich conversational switches are controlled by setting switchesallocated in common to a plurality 5 of conversational switches.

One object of the invention is, in systems where the allocation orsetting switches common to a plurality of conversational switches iseffected over auxiliary switches s to decrease the number of wipers inthese auxiliary switches, which in order to make possible a control ofconversational switches by setting switches, must correspond to thenumber of line groups located in the conver sational switch, this beingachieved by auxiliary switches controlled by conversational switchesbeing associated with the setting switches.

Another object of the invention is to decrease, as far as possible, thenumber of switching devices individually associated with theconversational switches and this is achieved in this manner that amovement (caused by the commonly associated switching devices) of theconversational switch used for a connection to the normal position iseffected, for the purpose of a fresh seizure of the conversationalswitch, only after a succeeding connecting operation by the commonswitching devices.

A further object of the invention is to make possible, at the setting upof a connection, only one seizure of the same conversational switchwhich is in the condition suitable for the setting up of the connectionin the moment of its seizure. This is achieved in this manner, that, atthe setting up of a connection, only conversational switches can beseized to which switching devices, operating the driving magnet, havebeen connected over auxiliary switches.

An embodiment of the invention is shown in the drawing.

A subscriber Tnl is seen who, over a preselector VlV, can influencefurther numerical impulse receivers succeeding this preselector, namelyIG /V, IIGl V and LvV for the setting up of a connection with the subscriber T012.

Only the setting circuit for the numerical 506,024, and in GermanyFebruary 22, 1930.

impulse receiver IIGlV is shown in the diagram. A setting of the furthernumerical impulse receivers can take place in any known manner.

The numerical impulse receiver IIGVV is only set in one directionalmovement (rotation) and in such a manner that the line group is markedby setting switches in which the conversational switch in the numericalimpulse receiver IIGlV then hunts for a tree line.

The setting switch and a further auxiliary switch,- for theestablishment of the connection is placed at the disposal of theconversational switch over a connecting switch.

In detail the connecting operations are as follows:

When the subscriber Tnl lifts his receiver, the preselector VVV huntsfreely for a succeediug numerical impulse receiver, e. IGlV in knownmanner. An energizing circuit for relay C is completed over the thirdwiper of the preselector VVV, while relay A is energized over the lineloop of the subscriber T121 in the circuit: earth, battery, winding 1 ofrelay A, wiper of preselector VlV, a-lead, subscriber T'nl, b-lead,wiper of preselector VVV, winding H of relay A, earth.

By the transmission of. numerical current impulses, e. g. theintern'iittent breaking of the energizing circuit for relay A, thenumerical impulse receiver IG W can be set to the required line group inany known manner. It hunts freely in this group for a succeedingnumerical impulse receiver and reaches, for example, the numericalimpulse receiver IIGXV on which a connecting switch is set so that relayP of the connecting switch is energized over: earth, contact 601, wiperal of the connecting switch, windings I and H of relay P, resistanceVH3, battery, earth.

At the seizure o1 the numerical impulse receiver the following circuitis completed: earth, resistance W32, wiper c of the numeri cal impulsereceiver IGlV, rotary off-normal contact 20 of the conversationalswitch, wiper c6 of the connecting switch, contact 2079, r0 taryoff-normal contact 21106 of the setting switch, 2220A of the auxiliaryswitch, relay V2, battery, earth. In this circuit relay V2 is energizedand connects the rotary magnet D6 of the setting switch to a speakinglead of the junction line by the closing of contact '1112 and placesrelay C2 in this engaging circuit by the closing of contact 19712.

hen the subscriber Tn-L sends out the next impulse series, the rotarymagnet Deisenergized over: earth, contacts 20, 1a, 3801, wiper c7 of theconnecting switch, contact 3102,. rotary magnet D6 of the settingswitch, battery, earth. Corresponding to the impulse series the wiper dcis, by way of example, set to contact 2 of its contact bank. After thefirst rotary step of the setting switch the forward switching of theconversational switch is effectedby its rotary magnet D being influencedover: earth, battery, rotary magnet D, contact 401, wiper a2 of theconnecting switch, contacts 1302, 122 2, Contact lld'h of the auxiliaryswitch, influenced by the rotary magnet Dh. contact lOtl, relayinterrupter HUI, earth.

At the forward switching; the switch shaft of the conversational switchoperates acontact 15m in such a manner that this contact, when reachingthe lastcontact of each individual line group, closes a circuit forrelay T2; In the present case, contact 15w is operated after theconversational switch has run through the ten contacts of the first linegroup (when the second line group is required) and this causes theenergization of relay T2. Herehy a further energization of the rotarymagnet D of the conversational switch is prevented at contact 1222. Inaddition the rotary magnet Dh of the auxiliary switch is influenced bythe closing of contact 25t2, with the result that its wiper (Z'h is seton contact 2 after a rotary step. In this switching; position anenergization of relay TI is completed, over: earth, battery, resistance'56, contact 3602, relay T1, wiper cle of the setting switch, contact 2,wiper (ZJI; of the auxiliary switch, earth. The contact l-l'dh, operatedat the energization of'the rotary magnet D/i', produces an impul'se'tooperate the rotary magnet D of the convers( tional switch over: earth,rotary magnet D, contacts 401, wiper a2 of the connectingsu-itch,13c2'.42t2', Llclh, earth. Theconversational switch moves onestep so that 15w is opened and relay thereby deenergized. After thedeenergization of' relay T2 the rotary magnet Dir of the auxiliaryswitch is also deeuergized. After relay T1 has also been deenergized bythe openingof the contact 36v2 after the termination of the impulseseries, the rotary magnet D of the conversational switch receives a newimpulse over: earth, battery, rotary magnet D of the conversationalswitch, contact 401 wiper a2 of the connecting switch, contacts I302,12t2, llclh, lOtl, RUl', earth.

The conversational switch now hunts freely in the reached line group fora free line,

for example, such a line that leads to the numerical impulse receiverLW. When this has been reached, the following circuit is completed:earth, battery, resistance W7, wiper 0 of the conversational switch,wiper a8 of the connecting switch, contacts 3202, 33t2, 35122, relay T1,wiper dc of the setting switch, contact 2, wiper (Zh of the auxiliaryswitclnearth. Relay T1 now responds. By the opening of contact IOtl therotary magnet of the conversational switch is brought to rest, causingthe relay P to deenergize by short circuiting, over contacts 702 and8t1, so that, by the short circuitingof the high resistance winding ofrelay C2 over contact 17]), an energization of relay C1 is caused over:earth, resistance V-Vz'2, c-wiper of the numerical impulse receiver IGW,winding I of relay Cl, wiper as of the connecting switch, contacts16'02, 17p, resistance W17 battery, earth. By the closing of contacts301 relay Cl connects itself with its winding 11 in a locking circuit.

After the deenerg-ization of relay C2, the auxiliary switch Dh is nowbrought to its normal position by the energization of its rotary magnetover: earth, battery, rotary magnet Dh of the auxiliary switch, rotaryoff-normal contact 4310b of the auxiliary switch, contact 2702, relayinterrupter RU2, earth. lVhen the auxiliary switch has reached itsnormal position, the setting switch is brought to its normal positionover the now closed rotary off-normal contact 26105 in thefollowingcircuit: earth, battery, rotary magnet De, rotary oft-normalcontacts 8070c, 264M, contact 2702, RU2, earth. When these switches havereached their normal positions, the connecting switch is connected up tothe next conversational switch, not taken into use, by its rotary magnetDa being energized over: earth, battery, rotary magnet Da, contact 28p,rotary oil-normal contact 29106, of the setting switch, 26wh oftheauxiliary switch,

contact 27 '02, relay interrupter RU2, earth. hen the connecting switchfinds a conversational switch, not takeninto' use, relay P is energizedin the circuit corresponding to the following: earth, contact 601, wipera1 1 of the connecting switch, windings P and II of relay P, resistancei-3, battery, earth. By the opening of contact 28p the connecting switchis brought to rest onthe reached conversational switch.

After the above described setting of the numerical impulse receiverIIGVV to the numerical impulse receiver LW, the subscriber can, bytransmission of further impulses, connect himself to the requiredsubscriber T2. After the transmission of ringing current and reply bythe subscriber the connection with the required subscriber Th2 isestablished.

The release of the switches, after the conversation is ended, is of nointerest in the present case as it can be effected in any known manner.

What is claimed is:

1. In an automatic telephone system, an incoming trunk line, an outgoingtrunk line, a first switch for interconnecting said trunk lines, asecond switch directively controlled by impulses to mark a particularcontact, automatic means for stepping said first switch, a third switchcontrolled at predetermined intervals by said first switch, cam sprin sin said first switch for ellccting said control over said third switch,and means operative responsive to said third switch and said secondswitch being positioned to corresponding contacts for stopping the automatic stepping of said first switch.

v 2. In an automatic telephone system, an incoming trunk line, anoutgoing trunk line, a first switch for interconnecting said trunklines, a second switch directively controlled by impulses to mark aparticular con tact, Elli tomatic means for stepping said first switch,a third switch controlled at predetermined intervals by said firstswitch, means operative responsive to said third switch and said secondswitch being positioned to corresponding contacts for stopping theautomatic stepping of said first switch, and a fourth switchautomatically controlled for connecting said second and third switchwith said first switch.

3. In an automatic telephone system, a plurality of switches forcompleting connections, a common control equipment for con trolling anyone of said plurality of switches, a connecting switch individual tosaid com mon control equipment, and means associated with said commoncontrol equipment for controlling said connecting switch to select anidle one of said plurality of switches and for making the selectedswitch seizable over its incoming trunk.

4. In an automatic telephone system, a plurality of switches, a commoncontrol equipment for controlling any one of said switches to establisha telephone connection, means for connecting said common controlequipment with an idle one of said switches to make it selectable overits incoming trunk, and means for disconnecting said common controlequipment from said switch after a connection is completed, said switchbeing maintained busy over its incoming trunk and held in its operatedposition after the release of said connection.

5. In an automatic telephone system, a plurality of switches, a commoncontrol equipment for controlling any one of said switches to establisha telephone connection, means for connecting said common controlequipment with an idle one of said switches to make it selectable overits incoming trunk, means for disconnecting said common controlequipment from said switch after a connection is completech'said switchbeing maintained busy over its incoming trunk and held in its operatedposition after the release of said connection, and means operative whensaid common control equipment is again connected to said switch forrestoring it to its normal position to make it selectable over itsincoming trunk.

6. In an automatic telcpone system, a first switch, a setting switch,means for positioning said setting switch, means for automaticallystepping said first switch, an auxiliary switch, means controlled atpredetermined intervals by said first switch for stepping said auxiliaryswitch, a circuit independent of the wipers of said first switch overwhich said stepping means is controlled, and means operative responsiveto the wipers of said auxiliary switch and said setting switch beingpositioned on corresponding contacts for stopping the stepping of saidfirst switch.

7. In an automatic telephone system, a first switch, a setting switch,means for positioning said settin witch, means lor automati callystepping said first switch, an auxiliary switch, means controlled at pretermined intervals by said first switch for ,pping said auxiliaryswitch, means operative responsive to the wipers of said auxiliaryswitch and said setting switch being positioned on correspondingCOHtflCJS for stopping the stepping of said first switch, a connectingswitch individual to said setting and auxiliary switches, and meansautomatically controlled for causing said connecting switch to beconnected with said first switch.

8. In an automatic te ephone system, a plurality of incoming i k linesand a plurality of outgoing trunk lines, a plurality of first switchesfor interconnecting sa d incoming trunk lines with said outgoing trunklines, common controlling equipment common to said first switches,second switch for connecting said common control equipment to an idleone of said first switches, means operative responsive to the connectingup of said common control equipment with a said first switch over saidsecond switch for making such first switch seizable over the associatedincoming trunk line, and means operative responsive to theinterconnecting of the associated incoming trunk line with one of saidoutgoing trunk lines for automatically d sconnecting said sccond switchfrom the first switch.

9. In an automatic telephone system, a plurality of incoming trunk linesand a plurality of outgoing trunk lines, a plurality of first switchesfor interconnecting said incoming trunk lines with said outgoing trunklines, common controlling equipment common to said first switches, asecond switch for connecting said common control equipment to an idleone of said first switches, means operative responsive to the connectingup of said: common control equipment with a said first switchover saidsecond switch for making sucli' first switch seiza-ble over theassociated incoming trunk line, means operative responsive to theinterconnection of the associated incoming trunk line with one of saidout-going trunk lines for automatically disconnecting said second switchfrom the first switch, and means operative responsive to the release ofsaid interconnection for temporarily making the first switch unavailableover the associated incoming trunk line.

10. In an automatic telephone system, a plurality of incoming trunklines and a plurality of outgoing trunk lines a plurality of firstswitches for interconnecting said incoming trunk lines with saidoutgoing trunk lines, common controlling equipment common to said firstswitches, a second switch for connecting said common control equipmentto an idle one of said' first switches, means operative responsive tothe connecting up of said common control equipment with a said firstswitch over said second switch for making such first switch seizableover the associated incoming trunk line, means operative responsivetothe interconnection of the associated incoming trunk line with one ofsaid outgoing trunk lines for automatically disconnecting said secondswitch from the first switch, means ope ative responsive to the releaseof said interconnection for temporarily making the first switchunavailable over the associated incoming trunk line and means forautomatically restoring the first switch to normal to make it availableover the associated incoming trunk line when it is again seized by saidsecond switch.

In witness whereof, I hereunto subscribe my name this 3rd day of-December, A. D.

ERNST HORN.

